Telephone-exchange system.



' A. E. LUN'DELL.

TELEPHONE EXCHANGE SYSTEM.

APPucmoN man 0c.22. 1915.

Patented July 2, 1918.

, fnvenfor;

A/ben E. Lam de Affy.

till

of New York, have 'angl useful Improvements in Telephone-EX- ALBEN n.runners, on new roan, n. r,

mcoarona'rnn, or new roan,

ASSIGNOR TO WESTERN ELECTRIC N. Y., A CORPQRATION OFNEW YORK.

coiulranr,

TELEPHONE-Emanuel; sysrmvr.

Specification of Letters Patent.

Patented aai s, ieis,

Application filed December 22, 1915. Serial No. 68,209.

To all whom it may concern Be it known that 1, ALBEN E. LUNDELL, acitizen of the United States, residing at New York, in the countyofBronx and State invented certain new nge Systems, of which the followingis a full, clear, concise, and exact description.

This invention relates to telephone exchange systems, and moreparticularly to semi-automatic telephone systems in which a connectionmay be established between two lines through a plurality of oilices.

It is the object of this invention to provide new and improved means atone oflice for supervising the establishment of a connection.

According to the main feature of this invention, a plurality of signals,provided at an operators position, are initially controlled from eachend of the connecting circuit, means being provided for controlling allof said signals from one end of the connecting circuit upon the completeestablishment of the desired connection.

The drawings represent diagrammatically a semi-automatic telephoneexchange system embodying the features of the present invention.

The selectors, sequence switches and the ender for controlling saidselectors forming no part of the present invention, are onlydiagrammatically represented in the drawings, and their operation isreferred to only in a general way in the description. It will be obviousto those skilled in the art that the present invention may be practisedin a telephone system in which manual means only or together withautomatic selector and connector switches of widely varying characterare employed without departing from the spirit of the invention. Adescription or a preferred form of automatic selectors, sequenceswitches and of a registering and sending apparatus for controlling theo. eration of said selectors may be had from. my copending applicationSerial No. 786,165, filed August 22, 1913.

A subscriber located at station 10, desiring to obtain a connection to astation 11 connected to the same exchange to which his line isconnected, removes his receiver from the switchhook, causing thereby theactuation of a well-known line signal (not shown) in fr nt of anoperator controlling a connecting circuit 12. The connecting operator,noticing the signal, inserts her plug 13 into an answering terminal 'orjack 14:

in which the line of station terminates, causing thereby the closure ofa circuit from grounded battery, through resistance 15, sleeve contactsof jack 14 and plug 13, and the winding of a relay 16 to ground. Thecalling line signal is extinguished in the well-known manner and acircuit is closed from the minus pole. of battery through the primarywinding of a repeating coil 17, the winding of an answering supervisoryrelay 18, the ring contacts of plug 13 and jack 14, the callingsubstation line circuit, the tip contacts of jack 1% and plug 13, andthe primary winding of re peating coil 17 to the plus pole of battery.Relay 18 becomes energized and closes a shunt from its front contactthrough conductor 19, on one hand through sequence switch contact 27,and on the other hand through conductor 20, the upper armature and backcontact of a relay 21, around a supervisory lamp 22, the circuitcomprising also a resistance 23 and the armature of relay 18. Relay 16closes a circuit from ground through its armature and front contact,contact 24 and the power magnet of a sequence switch 25 to groundedbattery, whereby the sequence-switch is moved, under the control of anormal spring 26, out of its first position into its twelfth position.Positions 2 to 11 of this sequence switch are made use of to control theconnection of the operators telephone set, the set being. connected tothe connecting circuit in position 7 or the sequence switch,andfurthermore, in these positions of the sequence switch, the operationof selector switches 30,- 31 and connector switch 32 is controlled.These switches are caused to select the desired line in position 11 ofsequence switch 25 under the control of the connecting operatorsregistering and sending apparatus. The desired station being located inthe same exchange, the operator adjusts selector to select a trunkleading to selector 31' by depressing a key 33 provided in her sendingapparatus. 1:" a registering switch 3' 1, asso ciated with the sender,is in position 11, a circuit will be closed from ground through key 33,contact 35 and the power magnet of register 34 to grounded battery,whereupon,

under the control of a s rin 3%. the p y/ register is moved out ofposition 11 into position 1. If this register is in any other positionthan in position 11,, the actuation of key 33 will not cause thedisplacement of the register. During the sending out of impulses, asequence switch (not shown) controlling the operation of a cord finder37 closes its contacts 38 from positions 4 to 15. The register 34 beingout of position 11, no circuit will be established for relay 21, and,{herefore a circuit is closed from ground, hrough sequence switchcontact 54, the lower armature and back contact of relay 21, contact andthe power magnet of sequence switch 25 to grounded battery, for drivingthis sequence switch out of position 12 into position 14. In position 14of the sequence switch, a circuit is closed from ground, throughsequence switch spring 40, a lamp 41, resistance 42 to grounded battery,and this lamp is lit, indicating to the connecting operator that thedesired line has been seized and is being signaled. The signaling of thecalled station is controlled by well'known apparatus associated withselector 31 or connector 32. When the called subscriber at station 11removes his receiver from the switchhook, a circuit is closed from theminus pole of battery through the secondary winding of repeating coil17, the winding of a calling supervisory relay 43, sequence switchcontact 44, the called substation loop, sequence switch contact 45 andthe secondary winding of repeating coil 17 to the plus ole of thebattery. Supervisory relay 4 becomes energized and closes a circuit fromground through its front contact and armature, sequence switch contact46, conductor 47 and the power magnet of sequence switch 25 to groundedbattery, for moving this sequence switch out of position 14- intoposition 16. Lamp 41 is now extinguished and a circuit is closed fromground, through sequence switch contact 53, lamp 52 and resistance 42 togrounded battery. This lamp, however, is prevented from lighting due tothe closure of a shunt from ground through the front contact andarmature of supervisory relay 43, sequence switch contact 50, resistance51, lamp 52,

and sequence switch contact 53 to ground.

Upon the completion of the connection, the sending and controllingapparatus is re leased to normal in the well-known manner.

After the termination of the conversation, the subscriber at station 11hangs up his receiver, and may cause, in the well-known manner, therestoration of switches 32 and 31. Belay 43 becomes deenergized andopens the shunt placed around lamp 52, and

this lamp will belighted. The lighting of lamp 52 indicates to theoperator that the subscriber at station 11 is through talking. When thecalling subscriber at station 10 restores his receiver to the hook,relay 18 will become denergized and open the shunt placed around lamp22, whereupon lamp 22 will be lighted due to the closure of a cir cultextending from ground, through sequence switch contact 60, lamp 22, andresistance 61 to grounded battery. The opera tor noticing now that bothsupervisory lamps are lighted, removes plug 13 from jack 14,deenergizing thereby relay 16, which closes a circuit from groundthrough its armature and back contact, contact 62 and the power magnetof sequence switch 25 to grounded battery, causing thereby the sequenceswitch to move out of 16 into its normal position. Selector 30 will bereleased and lamps 52 and '22 extinguished.

It will be noted from the above that supervisory relays 18 and 43,provided in the connecting circuit and controlled from the two ends ofthe connecting circuit by the calling and called subscribersrespectively, control the supervisory signals 22 and 52 respectively..The operation of one supervisory relay will not affect the signal.associated with the other supervisory relay in order to prevent thegiving of the clearing-out signal (lighting of both lamps) to theoperator if only one of the subscribers engaged in conversation restoreshis receiver;

lit the subscriber at station 10 desires to obtain a connection to astation 65 associated with a distant exchange, it will be necessary thatthis call be recorded at the calling subscribers exchange.

Upon the removal of the receiver at stationlO and the insertion of plug13 into jack 14,'relay 16 will cause the movement of sequence switch 25out of position 1 into position 12 in the above described manner. Theconnecting operator now sets selector 30 (in position 11 of sequenceswitch 34) to select a trunk terminating in a jack 66 at a recordingoperators position. When sequence switch 25 reaches its position 12, acircuit is closed from grounded battery through the winding of a relay67, selector 30, sequence switch contact 45 and the secondary winding ofrepeating coil 17 to ground. Relay 67 closes a circuit from groundthrough its front contact and armature, the armature and back contact ofrelay 68 and lamp 69 to grounded battery, for signaling the recordingoperator. A circuit is also closed from ground through sequence switchcontact 40, lamp 41 and resistance 42 to grounded battery, and thelighting of lamp 41 will indicate to the connecting operator that therecording operator is being grounded battery; Relay 43 closes a circuitfrom ground through its front contact and armature, sequence switchcontact 46, conductor 47 and the power magnet of sequence switch togrounded battery, for moving this switch out of position 12 intopositien 13.

The sequence switch will not be moved out of position 13 by a circuitthrough sequence switch contact 54 for the following reasons: In orderto set-selector on a trunk terminating in a jack in front of therecording operator, the connecting operator depressed key 72 instead ofkey 33. If register 34 was in a position between circuit was closed fromground through key 72, contact 73 and the power magnet of register 34 togrounded battery, for causing the movement of this register throughposition 10 into position 11. In position 11 a circuit is closed fromground through register con tact 64, cord finder sequence switchcontacts 38, and the winding of relay 21 to grounded battery. Relay 21becomes energized and locks up through a circuit closed from groundthrough ,sequence switch contact 54, and the lower armature, frontcontact and winding of this relay to grounded battery, opening at itslower back contact the circuit for sequence switch 25. By attracting itsupper armature, relay 21 opens ,the shunt around lamp 22. However,another shunt is closed for this lamp from ground through the frontcontact and armature of supervisory relay 43, sequence switch contact74, conductor 19, the front contact and arma ture of supervisory relay18 and resistance 1 23. A shunt being placed around lamp 22 throughsequence switch contact 27, this lamp will not be lighted in position 12of the sequence switch upon the energization of relay 21.

The recording operator converses now in the well-known manner with thecalling subscriber, and after having obtained his number and the numberof the desired subscriber, will make out the usual toll ticket. Therecording operator will converse with a switching or incoming operatorlocated at the same exchange at which the connecting operator is locatedand controlling selector switch 76 and connector switch 77. Theswitching operator, having received the number of the calling stationfrom the recording operator. causes said switches to extend one end of aconnecting circut 7 8 to the calling terminal 90 of station 10, and willinstruct the recording operator through an order wire (not shown) whichtrunk is used. The recording operatornotes the number of the trunk onthe toll ticket, and sends the same to atoll operator controllingconnecting circuit 75. The trunk assigned for use terminates in a jack79 in front of the toll operator. She will extend her conpositions 1 and10, a.

f the restoration of ing and called necting circuit by means of her plug80 arid jack 79 through connecting circuit 78 and switches 76 and 77 tothe calling substation 10, and extend the other end of her connectingcircuit 75 by any well-known means to the called subscribers station 65.The recording operator will engage bymeans of her plug 81 a jack 82connected in multiplc to jack 79, causing thereby the establishment of acircuit from ground, through the Winding of a relay 83, the sleevecontacts of plug 81 and jack 82, conductor 84, the sleeve contacts ofjack 79 and plug 80, and resistance 85 to grounded battery. Relay 83 becomes energized and closes a circuit for a lamp 86, indicating to therecording operator that the toll operator has taken care of the call.

The recording operator, after having made out the toll ticket, proceedsto sever the original connection established between her position andthe calling substation. By removing plug 70 from jack 66, she opens thecircuit of relays 71 and 43. Relay 43 re moves upon its de'nergizationthe shunts closed around lamps 22 and 52, causing thereby the lightingof both these lamps. The connecting operator will know now thatthis'connection may be takentdown. She will pull plug 13 out of jack 14,causing thereby selector 30.

It will be seen thus that in case of a toll call, a single supervisoryrelay 43 controls the calling and called supervisory signals, this beingnecessary as the supervisory re lay 18 remains energized as long as plug13 is inserted into jack 14, the calling sub-- scriber being engaged ina toll connection. The severing of the toll connection will beaccomplished in the well-known manner under the control of the toll andswitching op erators.

What is claimed is 1. In a telephone exchange system, a pinrality oflines, a connecting circuit by means of which two lines may beinterconnected, a plurality of supervisory signals individual to saidcircuit, and means under the sole control of one end of said circuit foroperatingsaid signals.

2. In a telephone exchange system, a plurality of lines, means forextending a calling line to a called line, a clearing-out signal, meansjointly controlled through said calllines for lighting said signal, andmeans operative upon the extension of a calling line to another calledline for lighting said signal under the sole control of said lastmentioned line.

3. In a telephone exchange system,='a plurality of lines, means forestablishing a connection between a calling and :1 called line, twosupervisory signals, means operable upon the establishment of a certainconneo loo tion for controlling one of said signals from the calling;and the other of said signals from the called end of said certainconnection, and means responsive to the establish ment of a certainother connection for controlling both of said signals from the calledend of said certainother connection 4. In a telephone exchange system, aplu rality of lines, operators positions, means for establishing aconnection between a calling and a called line, two supervisory signals,means for controlling one of said supervisory signals through thecalling" line, means operative upon the establishment of a connectionbetween two of said lines for controlling the other supervisory signalthrough the called line, and means operative upon the establishment of aconnection to an operators position for controlling both saidsupervisory signals through the called end of the connection.

5. In a telephone exchange system, a plurality of lines, two supervisorysignals, a connecting circuit, means for extending the same to a callingline, means operative thereupon for actuating one of said supervisorysignals, means for extending said connecting circuit to a called line,means operative thereupon actuating the other supervi sory' signal, andmeans operable through said called line for controlling the operation ofboth said supervisory signals.

6. In a telephone exchange system, a pluality of lines, a connectingcircuit, means for extending said circuit to a calling line,

a selector switch for extending said circuit to 2. called line, avariably operable sender or controlling said switch, a plurality ofsupervisory signals, and means actuated in ccordance with the operationoi said sender or controllingsaid signals through the called line.

it". in a telephone exchange system, a pin rality of lines, a connectingcircuit, means for extending saidcircuit to a calling line,

a selectively adjustable switch for extending said circuit to a calledline, a plurality of supervisory signals, and means responsive toadjustment of said switch for controlsaid signals from one end of saidcirin a telephone exchange system, a plo rality of lit cs, a conneinp;circuit, "vo supervisory relays in said circuit, two supervisory signameans for extending said circuit to a call; line, means operativethereupon for actuating one of said relays, means for extendi saidcircuit to a called line, means OPGl'ftchQ thereupon for: actuating anmyname this 18th day other one of said relays, means controlled by saidone relay for operating its associated signal, and means controlled bythe other re lay for controlling both said signals.

59. In a telephone exchange system, a plurality of lines, a connectingcircuit, two supervisory relays in said circuit, two super visorysignals, means for extending said connecting circuit to a calling line,means for extending the other end of said circuit to a called line, andmeans controlled by one of said relays for placing a shunt around eachof said signals.

10. In a telephone exchange system, a plurality of lines, a connectingcircuit, means for extending one end of said circuit to a calling line,means for extending the other end or said circuit to a called line, twosupervisory relays in said circuit, two supervisory signals, meansoperative upon the extension of said circuit to a calling line forcausing relay to place a shunt around one of saidsignals, meansoperative upon the extension of said circuit to a called line forcausing the other relay to place a shunt around the other signal and ashunt around said first mentioned signal, and means for removing'saidfirst mentioned shunt.

Ill. a telephone exchange system, a connecting circuit, two supervisoryrelays in said circuit, means for extending said circuit to a callingline, means for extending said circuit to a called line, two signals,means for placing one of said signals under the control of one of saidrelays upon the extension of said circuit to the calling line, and meansfor placing both of said Sig .als under the control of the otherrelayupon the extension of said circuit to the called line.

12. a telephone exchange system, apluraiity of lines, aconnectingcircuit, two supervisory relays provided in said circuit, twosupervisory lamps, contacts for said relays, means for extending saidcircuit to a callingline, means operative thereupon for closing a shuntthrough the contact only one of said relays around one of said lamps,means for extending said circuit to a called line, means operativethereupon for closing a shunt around the other lamp leading only throughthe contact of the other relay, means for closinga shunt around saidfirst mentl ned lamp leading}; through contacts of both said relays, andmeans "for ren'ioving l mentioned shunt.

in witness whereof, I r reunto subscribe '2 "'1 1 s, c 01' uecemcei,is... A)

till

